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Chapter 2 Isometric Projection and Multi View Drawings Below are the desired outcomes and usage competencies based on the completion of Chapter 2. Desired Outcomes: Usage Competencies: • Understand Isometric • Identify the three main projection divisions in Projection and 2D sketching. freehand engineering sketches and drawings: o Axonometric, Oblique, and Perspective • Knowledge of additional • Create one and two view drawings. Projection views and arrangement of drawing views. • Comprehend the history and • Identify the development of in historic CAD evolution of CAD and the systems and SolidWorks features, parameters development of SolidWorks. and design intent of a sketch, part, assembly and drawing. • Recognize Boolean operations and feature based modeling. • Apply the Boolean operation: Union, Difference and Intersection. PAGE 2 - 1 Isometric Projection and Multi View Drawings Engineering Graphics with SolidWorks 2014 Notes: PAGE 2 - 2 Engineering Graphics with SolidWorks 2014 Isometric Projection and Multi View Drawings Chapter 2 - Isometric Projection and Multi View Drawings Chapter Overview Chapter 2 provides a general introduction into Isometric Projection and Sketching along with Additional Projections and arrangement of views. It also covers advanced drawing views and an introduction from manual drafting to CAD. On the completion of this chapter, you will be able to: • Understand and explain Isometric Projection. • Create an Isometric sketch. • Identify the three main projection divisions in freehand engineering sketches and drawings: o Axonometric o Oblique o Perspective • Comprehend the history and evolution of CAD. • Recognize the following Boolean operations: Union, Difference, and Intersection. • Understand the development of SolidWorks features, parameters and design intent of a sketch, part, assembly and drawing. Isometric Projections There are three main projection divisions commonly used in freehand engineering sketches and detailed engineering drawings; they are: 1.) Axonometric, with its divisions in Isometric, Dimetric and Trimetric, 2.) Oblique, and 3.) Perspective. Let’s review the three main divisions. Axonometric is a type of parallel projection, more specifically a type of Orthographic projection, used to create a pictorial drawing of an object, where the object is rotated along one or more of its axes relative to the plane of projection. There are three main types of axonometric projection: Isometric, Dimetric, and Trimetric projection depending on the exact angle at which the view deviates from the Orthogonal. To display Isometric, Dimetric, or Trimetric of a 3D SolidWorks model, select the drop-down arrow from the View Orientation icon in the Heads-up view toolbar. PAGE 2 - 3 Isometric Projection and Multi View Drawings Engineering Graphics with SolidWorks 2014 Axonometric drawings often appear distorted because they ignore the foreshortening effects of perspective (foreshortening means the way things appear to get smaller in both height and depth as they recede into the distance). Typically; Axonometric drawings use vertical lines for those lines representing height and sloping parallel edges for all other sides. • Isometric Projection. Isometric projection is a method of visually representing three- dimensional objects in two dimensions, in which the three coordinate axes appear equally foreshortened and the angles between them are 120 º. The term "Isometric" comes from the Greek for "equal measure", reflecting that the scale along each axis of the projection is the same (this is not true of some other forms of graphical projection). • Dimetric Projection. A Dimetric projection is created using 3 axes but only two of the three axes have equal angles. The smaller these angles are, the less we see of the top surface. The angle is usually around 105º. PAGE 2 - 4
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